*Please note that aptamers have much lower molecular weights than antibodies. Thus, there are typically five to fifteen times as many moles or molecules of aptamers present in a solution containing an equal mass. For example, 100 micrograms of an aptamer is equivalent to 0.5 to 1.5 mg of antibody, depending on the particular aptamer.

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Glutathione S-Transferase pi 1, GSTP1, is a metabolic enzyme involved in detoxification. It protects cells from cytotoxic and carconogenic agents. GSTP1 is expressed in normal tissues. Reduced GSTP1 expression due to hypermethylation of the GSTP1 gene promotor has been demonstrated in many types of cancer.